Improved instrument for cleaning boiler-flues



UNITED STATES PATENT OEEICE.

JOHN M. SPIEGLE, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVED INSTRUMENT FOR CLEANING BOILER-FLUES.

Specification forming part of Letters Patent No. 51,362, dated December5, 1865.

described hereinafter, so as to form an instrument by which the interiorof tubes which form the flues ot' steam-boilers may be readily andeectually cleansed.

In order to enable others to make and use my invention, I will nowproceed to describe its construction and operation.

On reference to the accompanying drawings, which form a part ot' thisspecification, Figure 1 is a longitudinal section of my instrument forcleaniu g the tubes of steam-boilers, and Fig. 2 a transverse section onthe line l 2, Fig. l.

Ais acylindrical rod,on the outer end of which are cut screwthreadsadapted to a nut, a, the opposite end of the rod having an enlargement,b, in which is an internal screw-thread adapted to receive the screwedend of a rod or handle, B, of appropriate length.

A shoulder, e, is formed on the rod A by the enlargement b, and againstthis shoulder bears a washer, D, ot' cast-iron, there being a number ofthese washers on the rod A and a number of gum-elastic disks, E, each ofwhich is situated between two washers, the whole being confined to therod by the nut a and washerj'.

The gum-elastic disks are of the same dialneter as, or they may be atritle greater in diameter than,the interior of the tubes to becleansed, while the washers D are so much less in diameter than thedisks that the outer edges of the latter can readily yield.

The end ot' a rod or handle, B, of suitable length, is screwed into theenlargement b ofthe rod A, and the instrument is pushed backward andforward through the tube, from which the ashes and tarry matter arerapidly removed by the disks, which, although yielding readily to anyinequality in the tube, etfectually accomplish the desired purposewithout injuring the tube by scraping or abrading the met-al.

I claim as my invention and desire to secure by Letters Patent- As anewmanufacture, the within-described instrument, composed ot' the rod A,its series of washers D, disks E, 'of gum-elastic, and the nut a, or itsequivalent, 'the whole being con.

CHARLES E. FOSTER, J oHN WHITE.

